/* index.css是用来美化 网页首页面，即放CSS相关代码的*/
/* css: 浮动/display ; 盒子模型 ；文字样式 */
*{
    margin: 0;
    padding: 0;
    /* 内减模式 */
    box-sizing: border-box;
}

li{
    /* 清除列表符号 */
    list-style: none;
}
a{
    /* 清除下划线 */
    text-decoration: none;
}

/* 双伪类清除浮动 */
.clearfix::before,.clearfix::after{
    content: "";
    display: table;
 }
 .clearfix::after{
    clear: both;
}

body{
    background-color: #f3f5f7;
}

/* 版心 */
.wrapper{
    width: 1200px;
    margin: 0 auto;
}
/* ---------以上为网页的基本代码------------ */
/* 头部 */
.header{
    height: 42px;
    /* 可以分开写,但是一起写版心的位置不能改变 */
    margin: 30px auto;
}

h1{
    float: left;
}
/* 导航 */
.nav{
    float:left;

    margin-left: 70px;
    height: 42px;
}

.nav li{
    float: left;
    margin-right: 26px;
}

.nav li a{
    display: block;
    /* 使文字置于盒子中间 */
    padding: 0 9px;
    height: 42px;
    line-height: 42px;
    /* border: 2px solid #00a4ff; */

    font-size: 18px;
    color: #050505;
}

.nav li a:hover{
    border-bottom: 2px solid #00a4ff; 
}

/* 搜索 */
.search{
    float: left;
    margin-left: 59px;
    width: 412px;
    height: 40px;
    border: 1px solid #00a4ff;
}

.search input{/* 输入框的大小 */
    float: left;
    padding-left: 20px;
    width: 360px;
    height: 38px;
    border: 0;
}

/* 这种特殊的选择器；来控制placeholder */
.search  input::placeholder {
    font-size: 14px;
    color: #bfbfbf;
}

.search button {
    float: left;
    width: 50px;
    height: 40px;
    background-image: url(../images/btn.png);
    border: 0;
}

.user {
    float: right;
    margin-right: 35px;
    height: 42px;
    line-height: 42px;
}

.user img{
    /* 调节图片垂直对齐方式，middle:居中 */
    vertical-align: middle;
}

/* 轮播图 */
.banner {
    height: 420px;
    background-color: #1c036c;
}

.banner .wrapper {
    height: 420px;
    background-image: url(../images/banner2.png);
}

.banner .left {
    float: left;
    padding: 0 20px;
    width: 190px;
    height: 420px;
    background-color: rgba(0, 0, 0, 0.3);
    /* 行高属于控制文字的属性,能继承 */
    line-height: 44px;
}

.banner .left span {
    float: right;
}

.banner .left a {
    font-size: 14px;
    color: #fff;
}

.banner .left a:hover {
    color: #00b4ff;
}


.banner .right {
    float: right;
    margin-top: 50px;
    width: 228px;
    height: 300px;
    background-color: #fff;
}

.banner .right h2 {
    height: 48px;
    background-color: #9bceea;
    text-align: center;
    line-height: 48px;
    font-size: 18px;
    color: #fff;
}

.banner .right .content {
    padding: 0 18px;
}

.banner .right .content dl {
    padding: 12px 0;
    border-bottom:2px solid #e5e5e5;
}

.banner .right .content dt {
    font-size: 16px;
    color: #4e4e4e;
}

.banner .right .content dd {
    font-size: 14px;
    color: #4e4e4e;
}

.banner .right .more {
    display: block;
    margin: 4px auto 0;
    width: 200px;
    height: 40px;
    border: 1px solid #00a4ff;

    font-size: 16px;
    color: #00a4ff;
    font-weight: normal;

    text-align: center;
    line-height: 40px;
}

/* 精品推荐 */
.goods {
    margin-top: 8px;
    padding-left: 34px;
    padding-right: 26px;

    height: 60px;
    background-color: #fff;
    box-shadow: 0px 2px 3px 0px 
		rgba(118, 118, 118, 0.2);

    line-height: 60px;

}

.goods h2 {
    float: left;
    font-size: 16px;
    color: #00a4ff;
    font-weight: 400;
}

.goods ul {
    float: left;
    margin-left: 30px;
}

.goods ul li {
    float: left;
}

.goods li a {
    border-left: 1px solid #bfbfbf;
    padding: 0 30px;
    font-size: 16px;
    color: #050505;
}

.goods .xingqu {
    float: right;
    font-size: 14px;
    color: #00a4ff;
}

/* 精品课程 */
.box {
    margin-top: 35px;
}

.box .title {
    height: 40px;
}

.box .title h2 {
    float: left;
    font-size: 20px;
    color: #494949;
    font-weight: 400;
}

.box .title a {
    float: right;
    margin-right: 30px;
    font-size: 12px;
    color: #a5a5a5;
}

.box .content li {
    float: left;
    margin-right: 15px;
    margin-bottom: 15px;
    width: 228px;
    height: 270px;
    background-color: #fff;
}

.box .content li:nth-child(5n) {
    margin-right: 0;
}

.box .content li h3 {
    padding: 20px;
    font-size: 14px;
    color: #050505;
    font-weight: 400;
}

.box .content li p {
    padding: 0 20px;
    font-size: 12px;
    color: #999;
}

.box .content li span {
    color: #ff7c2d;
}

/* 版权 */
.footer {
    margin-top: 40px;

    padding-top: 30px;

    height: 417px;
    background-color: #fff;
}

.footer .left {
    float: left;
}

.footer .left  p {
    margin: 20px 0 10px;
    font-size: 12px;
    color: #666;
}

.footer .left a {
    display: inline-block;
    width: 120px;
    height: 36px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 36px;
    font-size: 16px;
    color: #00a4ff;
}

.footer .right {
    float: right;
}

.footer .right dl {
    float: left;
    margin-left: 120px;
}